2018 CITROEN C4 ECU

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Electronic stability control (ESC) incorporating the   following   systems:
-
 
a
nti-lock   braking   system   (ABS)   and  
e

lectronic   brake   force   distribution   (EBFD),
-
 
e
mergency   braking   assistance   (EBA),
-
 
w
heel   anti-slip   regulation   (ASR)   or   traction  
c

ontrol,
-
 
d
ynamic   stability   control   (DSC).
Electronic stability control (ESC)
Definitions
Anti-lock braking system (ABS)
and electronic brake force
distribution (EBFD)
This system improves the stability and manoeuvrability   of   your   vehicle   when   braking  
a

nd   contributes   towards   improved   control   on  
c

orners, in particular on poor or slippery road
surfaces.
The
  ABS   prevents   wheel   lock   in   the   event   of  
em

ergency
 b
raking.
The
  EBFD   manages   the   braking   pressure  
w

heel   by   wheel.
Emergency braking assistance
(EBA)
In an emergency, this system enables you to reach   the   optimum   braking   pressure   more  
q

uickly   and   therefore   reduce   the   stopping  
di

stance.
It
  is   triggered   according   to   the   speed   at   which  
t

he   brake   pedal   is   pressed.   This   is   felt   by   a  
r

eduction in the resistance of the pedal and an
increase
  in   the   effectiveness   of   the   braking.
Anti-slip regulation (ASR)
The ASR system (also known as Traction Control)   optimises   traction   in   order   to   limit  
w

heel   slip   by   acting   on   the   brakes   of   the   driving  
w

heels   and   on   the   engine.   It   also   improves  
t

he directional stability of the vehicle on
acceleration.
Dynamic stability control (DSC)
If there is a difference between the path
followed   by   the   vehicle   and   that   required   by  
t

he   driver,   the   DSC   monitors   each   wheel   and  
a

utomatically   acts   on   the   brake   of   one   or   more  
w

heels   and   on   the   engine   to   return   the   vehicle  
t

o   the   required   path,   within   the   limits   of   the   laws  
o

f   physics.
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When this warning lamp comes on, coupled with the STOP w arning lam p, a

ccompanied   by   an   audible   signal   and   a
 m

essage,   it   indicates   that   there   is   a   fault
 w

ith   the   electronic   brake   force   distribution
 (

EBFD), which could cause loss of control
of
  the   vehicle   when   braking.
Operation
When this warning lamp comes on, accompanied   by   an   audible   signal  
a

nd   a   message,   it   indicates   that   there  
i

s a fault with the ABS, which could
cause loss of control of the vehicle
when
 b

raking.
Anti-lock braking system (ABS)
and electronic brake force
distribution (EBFD)When changing  w heels  ( tyres  a nd  r ims),  m
ake   sure   that   these   are   approved   for  
y

our   vehicle.
Normal
  operation   of   the   ABS   may   make  
i

tself   felt   by   slight   vibrations   of   the   brake  
ped

al.
In emergency braking, press
very firmly without releasing the
pressure.
You must stop as soon as it is safe to do so.
In both cases, contact a CITROËN dealer or a
qualified
 w

orkshop.
Safety

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Dynamic stability control
(DSC) and anti-slip regulation
(ASR)The DSC system offers exceptional safety   in   normal   driving,   but   this   should  
n

ot   encourage   the   driver   to   take   extra  
r

isks   or   drive   at   high   speed.
The
  correct   operation   of   the   system  
d

epends on observation of the
manufacturer's
 r

ecommendations
 r

egarding   the   wheels   (tyres   and   rims),  
t

he   braking   components,   the   electronic  
c

omponents   and   the   CITROËN  
a

ssembly   and   operation   procedures.
After
  an   impact,   have   the   system  
c

hecked   by   a   CITROËN   dealer   or   a  
q

ualified
 w
orkshop.
Activation
These systems are activated automatically each   time   the   vehicle   is   started.
As
  soon   as   they   detect   a   problem   of   grip   or  
t

rajectory,   these   systems   act   on   the   operation   if  
t

he   engine   and   brakes.
Deactivation
In exceptional conditions (starting a vehicle which   is   bogged   down,   stuck   in   snow,   on   soft  
g

round...),   it   may   be   advisable   to   deactivate  
t

he   DSC   system,   so   that   the   wheels   can   move  
f

reely   and   regain   grip.
This
 
is
 
indicated
 
by
 
flashing
 
of
 
this
 
w

arning
 
lamp
 
in
 
the
 
instrument
 
panel.
Operating fault
But it is recommended that the system be r eactivated   as   soon   as   possible.
F

P
ress the button or,
depending
  on   version,  
t

urn   the   knob   to   this  
p

osition.
The indicator lamp in the button or the knob   comes   on:   the   DSC   system   no l

onger   acts   on   the   operation   of   the   engine.
Reactivation
The system is reactivated automatically each time   the   ignition   is   switched   back   on   or   from  
3

0 mph   (50   km/h).F
 
P
ress   the   button   again  
t

o   reactivate   it   manually.If
  this   warning   lamp   comes   on,  
a

ccompanied   by   an   audible   signal  
a

nd   a   message   in   the   screen,   this  
i

ndicates   a   fault   with   the   system.
Contact   a   CITROËN   dealer   or   a   qualified  
w

orkshop   to   have   the   system   checked.
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Grip control
Special patented traction control system which improves   traction   on   snow,   mud   and   sand.
This
  system,   the   operation   of   which   has   been  
o

ptimised   for   each   situation,   allows   you   to  
m

anoeuvre   in   most   conditions   of   poor   grip  
(

encountered
 d
uring
 t
ouring
 u
se).
The accelerator pedal should be pressed
sufficiently
 
t
o  
a
llow  
t
he  
s
ystem  
t
o  
u
se  
t
he  
p
ower  
o

f   the   engine.   Operation   at   high   engine   speeds  
i

s   completely   normal.
Associated with all-seasons M+S (Mud and
Snow)
  205/50   R   17   tyres,   this   system   offers  
a

  compromise   between   safety,   adhesion   and  
t

raction.   These   tyres   work   equally   well   in   winter  
a

nd   summer.
A five-position selector allows you to choose
the
  setting   best   suited   to   the   driving   conditions  
en

countered.
An
  indicator   lamp   associated   with   each   mode  
c

omes   on   to   confirm   your   choice.
A specific and additional display appears
temporarily
  in   the   touch   screen   to   confirm   the  
s

election   made   with   the   knob. Every
  time   the   ignition   is   switched   off,  
t

he   system   automatically   resets   to   this  
m

ode.
Differents
  modes   are   provided:
Standard (ESC)
This mode is calibrated for a low level of wheel s
pin,   based   on   the   different   levels   of   grip  
n

ormally   encountered   on   the   road.
F
 
P
lace   the   dial   in   this   position.
Snow
This mode adapts its strategy to the conditions of   grip   encountered   for   each   of   the   two   front  
w

heels   on   moving   off.
(mode
  active   up   to   30   mph   (50   km/h))
F
 
P
lace   the   dial   in   this   position.
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Driving advice
Your vehicle is designed principally to drive   on   tarmac   roads   but   it   allows   you  
t

o drive on other less passable terrain
occasionally.
However,
  it   does   not   permit   off-road  
d

riving   such   as:
-
 
c
rossing   and   driving   on   terrain  
w

hich   could   damage   the   underbody  
o

r   strip   away   components   (fuel  
p

ipe,   fuel   cooler...)   due   to   obstacles  
o

r stones in particular,
-
 
d
riving   on   terrain   with   steep  
g

radients   and   poor   grip,
-
 
c
rossing   a   stream.All terrain (mud, damp grass, ...)
This mode, when moving off, allows considerable spin on the wheel with the least
grip
  to   optimise   clearing   of   the   mud   and   regain  
g

rip.   At   the   same   time,   the   wheel   with   the   most  
g

rip   is   controlled   in   such   a   way   as   to   pass   as  
m

uch   torque   as   possible.
When
  moving,   the   system   optimises   wheel   spin  
t

o   respond   to   the   driver's   requirements   as   fully  
a

s   possible.
(mode
  active   up   to   50   mph   (80   km/h))
F
 
P
lace   the   dial   in   this   position.
Sand
This mode allows little spin on the two driving wheels   at   the   same   time   to   allow   the   vehicle   to  
m

ove   for ward   and   limit   the   risks   of   getting   stuck  
i

n   the   sand.
(mode
  active   up   to   75   mph   (120   km/h))
F
 
P
lace   the   dial   in   this   position.
Do
  not   use   the   other   modes   on   sand   as   the  
v

ehicle   may   become   stuck. You can deactivate certain functions of the
ESC
  (ASR   and   DSC)   by   turning   the   dial   to   the  
"
O
FF
"   position.
These   functions   are   reactivated   automatically  
f

rom   30   mph   (50   km/h)   or   every   time   the  
i

gnition   is   switched   back   on.
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Seat belts
Front seat belts
The front seat belts are fitted with a
pretensioning  and   force   limiting   system.
This
  system   improves   safety   in   the   front  
s

eats   in   the   event   of   a   front   or   side   impact.  
D

epending   on   the   severity   of   the   impact,   the  
p

retensioning   system   instantly   tightens   the   seat  
b

elts   against   the   body   of   the   occupants.
The
  pretensioning   seat   belts   are   active   when  
t

he   ignition   is   on.
The
  force   limiter   reduces   the   pressure   of   the  
s

eat belt on the chest of the occupant, so
improving
  their   protection.Fastening
F Pull  the   strap,   then   insert   the   tongue   in  t
he buckle.
F
 
C
heck   that   the   seat   belt   is   fastened  
c

orrectly   by   pulling   the   strap.
Unfastening
F Press  the   red   button   on   the   buckle.
F  G uide   the   seat   belt   as   it   reels   in.
Rear seat belts
The rear seats are each fitted with a three-point
seat  belt.
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From approximately 12 mph (20 km/h),   the   warning   lamp(s)  
f

lash   for   two   minutes   accompanied  
b

y   an   audible   signal.   Once   these  
t

wo minutes   have   elapsed,   the  
w

arning   lamp(s)   remain   on   until   the  
d

river   or   front   passenger   fastens   their  
s

eat   belt.
Seat belt not fastened /
unfastened warning lamps Front seat belt warning lamps
On switching on the ignition, warning lam
p 1   comes   on   in   the   instrument  
p

anel   and   the   corresponding   warning  
l

amp   (2 and 3 )
  comes   on   in   red   in  
t

he   passenger's   seat   belt   and   front  
a

irbag   warning   lamp   display   if   the  
d

river's   seat   belt   or   front   passenger's  
s

eat belt is not fastened or is
unfastened.
1.
 F

ront
 
seat
 
belts
 
not
 
fastened
 
/
 
unfastened
 
w

arning
 
lamp
 
in
 
the
 
instrument
 
panel.
2.
 F

ront
 
left
 
seat
 
belt
 
warning
 
lamp.
3.
 F

ront
 
right
 
seat
 
belt
 
warning
 
lamp.
4.
 R

ear
 
right
 
seat
 
belt
 
warning
 
lamp.
5.
 R

ear
 
centre
 
seat
 
belt
 
warning
 
lamp.
6.
 R

ear
 
left
 
seat
 
belt
 
warning
 
lamp.
Rear seat belt warning lamps
The corresponding warning lamp ( 4
to 6 )
  comes   on   in   red   in   the  
s

eat   belt   and   front   airbag   warning  
l

amp   display   if   one   or   more   rear  
p

assengers
 u
nfasten
 t
heir
 sea
t
 b
elt.
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The driver must ensure that passengers use the seat belts correctly and that they are all
fastened
  before   setting   off.
Wherever you are seated in the vehicle,
always fasten your seat belt, even for short
journeys.
Do
  not   interchange   the   seat   belt   buckles   as  
t

hey   will   not   fulfil   their   role   fully.
The seat belts are fitted with an inertia reel
permitting
  automatic   adjustment   of   the  
l

ength   of   the   strap   to   your   size.   The   seat   belt  
i

s   stowed   automatically   when   not   in   use.
Before and after use, ensure that the seat
belt
  is   reeled   in   correctly.
The
  lower   part   of   the   strap   must   be  
p

ositioned   as   low   as   possible   on   the   pelvis.
The
  upper   part   must   be   positioned   in   the  
h

ollow   of   the   shoulder.
The
  inertia   reels   are   fitted   with   an   automatic  
l

ocking   device   which   comes   into   operation   in  
t

he   event   of   a   collision,   emergency   braking  
o

r   if   the   vehicle   rolls   over.   You   can   release  
t

he   device   by   pulling   the   strap   firmly   and  
t

hen   releasing   it   so   that   it   reels   in   slightly.Recommendations for
children
Use a suitable child seat if the passenger is less than 12 years old or shorter than one
and
  a   half   metres.
Never
  use   the   same   seat   belt   to   secure   more  
t

han   one   person.
Never
  allow   a   child   to   travel   on   your   lap.
For
  more   information   on   child   seats,   refer   to  
t

he   corresponding   section.
In
 
order
 
to
 
be
 
effective,
 
a
 
seat
 
belt
 
must:
-
 
b

e
 
tightened
 
as
 
close
 
to
 
the
 
body
 
as
 p
ossible,
-
 b
e
 
pulled
 
in
 
front
 
of
 
you
 
with
 
a
 
smooth
 
m

ovement,
 
checking
 
that
 
it
 
does
 
not
 
t

wist,
-

b

e used to restrain only one person,
-
 
n

ot
 
bear
 
any
 
trace
 
of
 
cuts
 
or
 
fraying,
-
 
n

ot
 
be
 
converted
 
or
 
modified
 
to
 
avoid
 
a

ffecting
 it

s
 p

erformance.
In the event of an impact
Depending on the nature and
seriousness of the impact , the
pretensioning
  device   may   be   deployed  
b

efore   and   independently   of   the   airbags.  
D

eployment   of   the   pretensioners   is  
a

ccompanied   by   a   slight   discharge   of  
h

armless   smoke   and   a   noise,   due   to   the  
a

ctivation   of   the   pyrotechnic   cartridge  
i

ncorporated   in   the   system.
In
  all   cases,   the   airbag   warning   lamp  
comes
  on.
Following
  an   impact,   have   the   seat   belts  
s

ystem   checked,   and   if   necessary   replaced,  
b

y   a   CITROËN   dealer   or   a   qualified  
w

orkshop.
In accordance with current safety
regulations,
 
for
 
all
 
repairs
 
on
 
your
 
vehicle's
 
s

eat
 
belts,
 
go
 
to
 
a
 
qualified
 
workshop
 
with
 t
he
 
skills
 
and
 
equipment
 
needed,
 
which
 
a
 C
ITROËN
 
dealer
 
is
 
able
 
to
 
provide.
Have
 
your
 
seat
 
belts
 
checked
 
regularly
 
by
 
a

 
CITROËN
 
dealer
 
or
 
a
 
qualified
 
workshop,
 
p

articularly
 
if
 
the
 
straps
 
show
 
signs
 
of
 
d

amage.
Clean the seat belt straps with soapy
water
 
or
 
a
 
textile
 
cleaning
 
product,
 
sold
 
by
 
C

ITROËN
 
dealers.
After
 
folding
 
or
 
moving
 
a
 
seat
 
or
 
rear
 
bench
 
s

eat, ensure that the seat belt is positioned
and
 
reeled
 
in
 
correctly.
Advice
Safety